el error es
Warning: Failed opening 'header.php' for inclusion (include_path='.;c:\apache\php\pear') in c:\apache\htdocs\pagina\staff\plantilla.php on line 12
y el codigo es
<html>
<body>
<div class="content">
<div class="header">
<? include 'header.php'; ?>
</div>
</div>
</body>
</html>
gracias de antemano